diff --git i/facebook_comments_box.module w/facebook_comments_box.module
index 3fe38fe..1c59a61 100644
--- i/facebook_comments_box.module
+++ w/facebook_comments_box.module
@@ -52,7 +52,7 @@ function facebook_comments_box_block($op = 'list', $delta = 0, $edit = array())
 
       // If the nodetype is set and selected in config, then load the comments
       // on the page.
-      if (isset($node_type) && in_array($node_type, $fcb_node_types) && $node->status) {
+      if (isset($node_type) && isset($fcb_node_types[$node_type]) && $node->status) {
 
         // Figure out the current absolute URL.
         $path = isset($_GET['q']) ? $_GET['q'] : '<front>';